/*
* jQuery Iframe Transport Plugin 1.3
* https://github.com/blueimp/jQuery-File-Upload
*
* Copyright 2011, Sebastian Tschan
* https://blueimp.net
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/MIT
*/

/*jslint unparam: true, nomen: true */
/*global define, window, document */

function addTransport() {

    (function (factory) {
        'use strict';
        if (typeof define === 'function' && define.amd) {
            // Register as an anonymous AMD module:
            define(['jquery'], factory);
        } else {
            // Browser globals:
            factory(window.$j);
        }
    } (function ($) {
        'use strict';

        // Helper variable to create unique names for the transport iframes:
        var counter = 0;

        // The iframe transport accepts three additional options:
        // options.fileInput: a jQuery collection of file input fields
        // options.paramName: the parameter name for the file form data,
        //  overrides the name property of the file input field(s)
        // options.formData: an array of objects with name and value properties,
        //  equivalent to the return data of .serializeArray(), e.g.:
        //  [{name: 'a', value: 1}, {name: 'b', value: 2}]
        $j.ajaxTransport('iframe', function (options) {
            if (options.async && (options.type === 'POST' || options.type === 'GET')) {
                var form,
                iframe;
                return {
                    send: function (_, completeCallback) {
                        
                        form = $j('<form style="display:none;"></form>');
                        // javascript:false as initial iframe src
                        // prevents warning popups on HTTPS in IE6.
                        // IE versions below IE8 cannot set the name property of
                        // elements that have already been added to the DOM,
                        // so we set the name along with the iframe HTML markup:
                        iframe = $j(
                        '<iframe src="javascript:false;" name="iframe-transport-' +
                            (counter += 1) + '"></iframe>'
                    ).bind('load', function () {
                        var fileInputClones;
                        iframe
                            .unbind('load')
                            .bind('load', function () {
                                var response;
                                // Wrap in a try/catch block to catch exceptions thrown
                                // when trying to access cross-domain iframe contents:
                                try {
                                    response = iframe.contents();
                                    // Google Chrome and Firefox do not throw an
                                    // exception when calling iframe.contents() on
                                    // cross-domain requests, so we unify the response:
                                    if (!response.length || !response[0].firstChild) {
                                        throw new Error();
                                    }
                                } catch (e) {
                                    response = undefined;
                                }
                                // The complete callback returns the
                                // iframe content document as response object:
                                completeCallback(
                                    200,
                                    'success',
                                    { 'iframe': response }
                                );
                                // Fix for IE endless progress bar activity bug
                                // (happens on form submits to iframe targets):
                                $j('<iframe src="javascript:false;"></iframe>')
                                    .appendTo(form);
                                form.remove();
                            });
                        form
                            .prop('target', iframe.prop('name'))
                            .prop('action', options.url)
                            .prop('method', options.type);
                        if (options.formData) {
                            $j.each(options.formData, function (index, field) {
                                $j('<input type="hidden"/>')
                                    .prop('name', field.name)
                                    .val(field.value)
                                    .appendTo(form);
                            });
                        }
                        if (options.fileInput && options.fileInput.length &&
                                options.type === 'POST') {
                            fileInputClones = options.fileInput.clone();
                            // Insert a clone for each file input field:
                            options.fileInput.after(function (index) {
                                return fileInputClones[index];
                            });
                            if (options.paramName) {
                                options.fileInput.each(function () {
                                    $j(this).prop('name', options.paramName);
                                });
                            }
                            // Appending the file input fields to the hidden form
                            // removes them from their original location:
                            form
                                .append(options.fileInput)
                                .prop('enctype', 'multipart/form-data')
                            // enctype must be set as encoding for IE:
                                .prop('encoding', 'multipart/form-data');
                        }
                        form.submit();
                        // Insert the file input fields at their original location
                        // by replacing the clones with the originals:
                        if (fileInputClones && fileInputClones.length) {
                            options.fileInput.each(function (index, input) {
                                var clone = $j(fileInputClones[index]);
                                $j(input).prop('name', clone.prop('name'));
                                clone.replaceWith(input);
                            });
                        }
                    });
                        form.append(iframe).appendTo(document.body);
                    },
                    abort: function () {
                        if (iframe) {
                            // javascript:false as iframe src aborts the request
                            // and prevents warning popups on HTTPS in IE6.
                            // concat is used to avoid the "Script URL" JSLint error:
                            iframe
                            .unbind('load')
                            .prop('src', 'javascript'.concat(':false;'));
                        }
                        if (form) {
                            form.remove();
                        }
                    }
                };
            }
        });

        // The iframe transport returns the iframe content document as response.
        // The following adds converters from iframe to text, json, html, and script:
        $j.ajaxSetup({
            converters: {
                'iframe text': function (iframe) {
                    return $j(iframe[0].body).text();
                },
                'iframe json': function (iframe) {
                    return $j.parseJSON($j(iframe[0].body).text());
                },
                'iframe html': function (iframe) {
                    return $j(iframe[0].body).html();
                },
                'iframe script': function (iframe) {
                    return $j.globalEval($j(iframe[0].body).text());
                }
            }
        });

    }));
}

addTransport();